Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Sun Apr 07 2019 Valid 00Z Mon Apr 08 2019 - 00Z Wed Apr 10 2019 ...Severe weather and heavy rainfall continues into tonight across the Lower Mississippi Valley and Gulf Coast states, with severe thunderstorms possible across the Southeast on Monday... ...Heavy rainfall likely across parts of the Pacific Northwest, with heavy snowfall possible in the higher terrain of the Northern Rockies... Strong convection from the Lower Mississippi Valley to the Tennessee Valley this afternoon will continue into tonight, with severe thunderstorms and heavy rainfall possible. SPC continues to highlight much of the Lower Mississippi Valley to the Tennessee Valley within a slight risk for severe weather, while WPC has roughly the same area within a slight risk for excessive rainfall/flash flooding through tomorrow morning. This activity will shift eastward on Monday, with rain and thunderstorms also likely farther north along a trailing cold front from the Tennessee Valley to the Ohio Valley, Great Lakes, and the Northeast associated with a northern stream system. For Monday, SPC has a slight risk for severe weather across the southern Mid-Atlantic states to parts of the Southeast. Locally heavy rainfall is also possible, especially across the Gulf Coast and Tennessee Valley. Snow is possible across far northern New England, where snowfall totals up to a foot may be possible through Tuesday as a pair of surface lows track through the Northeast. Meanwhile, an atmospheric river in the Pacific Northwest will continue to produce heavy rainfall across parts of western Oregon and far northwest California with model guidance showing multiple inches of rain possible. WPC has a slight risk for excessive rainfall/flash flooding in this region through Monday morning, with flash flood watches in effect for many locations as well. The cold front should press south and eastward on Monday and Tuesday through the Northwest, with lower elevation rain and mountain snows likely across the Great Basin and Intermountain West states. The best chance for accumulating snowfall will be in the Northern Rockies. Temperatures across much of the nation will the above average on Monday with the greatest anomalies of +15 to +25 degrees from the Central Plains to the northern Mid-Atlantic. The northwest and far northern states should cool to near or below normal by Tuesday, while the remainder of the country remains warm. On Tuesday, temperatures across the southern and central High Plains could be 10 to 20+ degrees above normal. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php